Launched in 2006, iLike has 55 million registered users across several social network platforms. Through iLike, users can share playlists, buy songs and find concert tickets.

The 26-employee company will remain headquartered in Seattle and founders Ali Partovi, Hadi Partovi and Nat Brown will stay with the firm.

“By joining forces with MySpace, we think we can provide an unmatched social music platform to help you discover music and connect with your favorite artists,” the Partovi brothers wrote on the iLike company blog.

With the deal, Van Natta said the company can focus “on areas where MySpace has been strongest. “Music and entertainment are a very important part of people’s lives,” he said.

He also said he expected Facebook and other social networks to be “thrilled” by the deal. There was no immediate comment from Facebook.

UPDATE: Here’s a statement from Facebook:

iLike was one of the first applications built on Facebook Platform and has become a success with more than 10 million monthly active users. We expect that users will continue to discover and share music through the iLike application on Facebook. We look forward to working with the iLike team to make music a great social experience on Facebook and across the Web.